At 900 RPM, both alternators are right around 2600RPM. So CS144 should put out ~115A, CS130D puts out ~85-90A (hard to say since the graph doesn't have the 125A on it). I'm actually a bit surprised I thought the CS130D put out less at idle. That said, I still personally do the upgrade. I ran my car for less than 1 song of music (setting up head unit stuff), shut the car off went out and touched the alternator and it was hotter than the engine, lol.